TAC Vector Optics Hunting Tactical Sniper Riflescope Paragon 5-25x56 with Long Eye Relief, German Glass ML Reticle, 1/10 MIL Adjustment, Red Illumination and Free Mount Ring Super Sharp Clear by Using German Glass 1/10 MIL Adjustment W/ Honeycomb Sunshade & Heavy Duty Mount Ring Tactical Turrets with Lock Feature 30mm Monotube Heavy Duty Model: SCOL-03 Paragon Magnification: 5-25x Objective Lens Dia: 56mm Ocular Dia: 38mm (1.5 inch) Ocular Length: 52mm (2.0 inch) Exit Pupil: 2.1-8.3 mm Overall length: 385mm (15.1 Inch) Distance between objective lens part and middle turret: 65mm (2.5 inch) Length of middle turret part: 45mm (1.8 inch) Distance between middle turret part to power ring: 50mm (2.0 inch) Weight (net): 800g (28.2 Ounce) Eye Relief: &gt;100mm (&gt;4.0 Inch) Field of View (ft@100yds): 19.5-3.9 feet Optical Coating: Fully-multi diamond coated by using Germany Schott glass Side wheel parallax: min at 50 Yards, 100, 200, 400 and infinite Reticle: MIL line etched glass reticle Elevation Range: 60 MOA (18 MIL) Windage Range: 60 MOA (18 MIL) Stepless red illumination system 30mm monotube Shock proof, water proof and fog proof (Nitrogen purged) High quality aluminum alloy in durable MIL-spec style black matte finish Feature 1/10 MIL direct finger windage and elevation turrets adjustments Turret lock feature: press down to lock without click movement Fast focus eyepiece at ocular lens adjustment (diopter compensation -2.0dpr to +1.5dpr) Free fitting involved: 30mm tactical picatinny ring (default) or weaver or dovetail mount, lens caps and honeycomb sunshade etc.